linux-kernel - Re: [PATCH] Added PR_SET_PROCTITLE

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Date:	Mon, 5 Oct 2009 00:10:04 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	matthieu castet <castet.matthieu@...e.fr>
Cc:	linux-kernel@...r.kernel.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Timo Sirainen <tss@....fi>, Bryan Donlan <bdonlan@...il.com>,
	Ulrich Drepper <drepper@...hat.com>
Subject: Re: [PATCH] Added PR_SET_PROCTITLE_AREA option for prctl()

>> PR_SET_PROCTITLE_AREA updates mm_struct->arg_start and arg_end to the
>> given pointers, which makes it possible for user space to implement
>> setproctitle(3) cleanly.
>>
>>
> Why can't you use PR_SET_NAME ?

example:

% ps -ef |grep sendmail
root      2444     1  0 Oct04 ?        00:00:00 sendmail: accepting connections
smmsp     2454     1  0 Oct04 ?        00:00:00 sendmail: Queue
runner@01:00:00 for /var/spool/clientmqueue
kosaki    3927  2907  0 00:02 pts/1    00:00:00 grep sendmail



Almost setproctitle() heavy user (e.g. sendmail, openssh and some bsd
style daemon programs) use long string rather than 16.



> And with PR_SET_NAME, you can a name per thread, which you can't do by changing
> arg[0] name (it should be shared across all thread).
>
> Matthieu
>
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